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Research progress in nickel-rich ternary materials for lithium-ion batteries
YUAN Song-dong, YANG Can-xing, JIANG Guo-dong, XIONG Jian, AI Qing, HUANG Ren-zhong
Journal of Materials Engineering    2019, 47 (10): 1-9.   DOI: 10.11868/j.issn.1001-4381.2018.001301
Abstract   PDF (1893KB)
Nickel-rich ternary materials for lithium ion batteries are the preferred cathode materials for automotive power batteries at present and in the future, due to their low cost, high energy density, high reversible capacity and environmental friendliness. On the basis of reviewing the crystal structure and electrochemical properties of nickel-rich ternary materials, the main preparation methods at home and abroad, modification methods such as doping, coating and others were introduced. Meanwhile, the effect of different kinds of coating materials on rate performance, cycling performance and good thermal stability of nickel-rich ternary was discussed in details. Finally, the issues about nickel-rich ternary electrolyte solution, safety, compaction density and cycle life were analyzed and prospected.
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Research progress of metal organic framework in supercapacitors
KANG Min-xia, ZHOU Shuai, XIONG Ling-heng, NING Feng, WANG Hai-kun, YANG Tong-lin, QIU Zu-min
Journal of Materials Engineering    2019, 47 (8): 1-12.   DOI: 10.11868/j.issn.1001-4381.2018.000542
Abstract   PDF (3543KB)
Supercapacitors are a new type of energy storage element that has been rapidly developed in recent years. The most important factor that determines the performance of supercapacitors is electrode materials. The development of low-cost, high-performance electrode materials is an important research direction for current supercapacitors. Metal-organic frameworks (MOFs) are a class of porous materials. The applications of MOFs in the supercapacitor have attracted more and more researchers due to their diverse composition and structure, large specific surface area, controllable structure and adjustable pore size. Recent researching application progress of pristine MOFs, MOFs-derived(porous carbon, metal oxides, porous carbon/metal oxides) and MOFs-composite materials for supercapacitors was summarized in this paper. The MOFs with different structural characteristics and their specific performance in the field of electrochemical energy storage were discussed. MOFs based supercapacitors are demonstrated to play an important role in the field of new energy storage and conversion. Finally, the current challenges, future trends and prospects of MOFs in the field of ultracapacitors were pointed out.
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Progress in elastic property and impact resistance of honeycomb structure mechanical metamaterial
SU Ji-long, WU Jin-dong, LIU Yuan-li
Journal of Materials Engineering    2019, 47 (8): 49-58.   DOI: 10.11868/j.issn.1001-4381.2018.001476
Abstract   PDF (3766KB)
Mechanical metamaterial composed of chiral honeycomb structure is high performance engineering materials developed in recent years. They have the advantages of light weight, high specific stiffness, negative Poisson's ratio, adjustable structural parameters and stable mechanical properties. It not only can realize the dual mechanical functions of in-plane deformation and out-of-plane load-bearing, but also has excellent engineering application performance such as vibration isolation and sound absorption and noise reduction and control of elastic wave propagation. It has great potential in the fields of intelligent structure, vehicle, ship, aerospace and so on. Two mechanical aspects of its elastic properties and impact resistance were reviewed.First, the progress of theoretical analysis and research on the elastic properties such as the surface poplar modulus, negative Poisson's ratio, and elastic properties of external shear modulus of mechanical metamaterials were reviewed and commented. Further, in the aspect of impact resistance, the overall deformation and impact resistance of the existing chiral honeycomb mechanical metamaterials under impact load were reviewed based on perspectives of model establishment and finite element analysis. Finally, it was pointed out that in the further research of elasticity and impact properties, the mechanical model of internal ligament deformation and force transmission can be further established and the energy absorption mechanism of the impact process to be further explored so as to provide the reference for the optimization design of the internal structure of ligaments and node rings in this type of metamaterial.
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Research progress in stress and deformation control in laser additive manufacturing for high-performance metals
CHEN Yong, CHEN Hui, JIANG Yi-shuai, WANG Qian, WU Ying, XIONG Jun, DONG Shi-yun
Journal of Materials Engineering    2019, 47 (11): 1-10.   DOI: 10.11868/j.issn.1001-4381.2018.001430
Abstract   PDF (2235KB)
With the development of basic theoretical research and equipment, laser additive manufacturing technology is widely used in the manufacture of large complex components. However, the internal stress in laser additive manufacturing process tends to result in distortion and cracking. Stress and deformation control has become an urgent issue in laser additive manufacturing process. In this paper, research progress of residual stress in laser additive manufacturing was reviewed from various aspects such as residual stress forming mechanism, test methods, control measures. Furthermore, the main problems and research directions were proposed for the research of stress and deformation control technology, which provides guidance for the research of "shape control" in laser additive manufacturing.
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Preparation of a new two-dimensional nanomaterial MXene and its application progress in energy storage
DANG A-lei, FANG Cheng-lin, ZHAO Zhao, ZHAO Ting-kai, LI Tie-hu, LI Hao
Journal of Materials Engineering    2020, 48 (4): 1-14.   DOI: 10.11868/j.issn.1001-4381.2019.000390
Abstract   PDF (8981KB)
As a new type of two-dimensional nanomaterials, MXene has been widely investigated since its discovery at 2011 due to its excellent physical and chemical properties, such as high conductivity, good lubricity, electromagnetism and other special properties. Hence, in addition to the performance of the traditional two-dimensional materials, MXene has been extensively used in the fields of energy storage, catalysis, lubrication, electromagnetic shielding, sensor, water purification and so on,and certain results and progress were achieved. The latest researches of MXene at structure, property and preparation methods, as well as the related achievements in lithium ion battery, supercapacitor and others at our country and overseas in recent years were reviewed in this paper. Moreover, the shortcomings of current research were summarized, and the future research direction were prospected as well.
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Research progress in 3D printing technology for carbon nanotubes composites
LU Hao, LI Nan, WANG Hai-bo, LIAO Bang-quan, JIANG Ya-ming, JING Miao-lei, XU Zhi-wei, CHEN Li, ZHANG Xing-xiang
Journal of Materials Engineering    2019, 47 (11): 19-31.   DOI: 10.11868/j.issn.1001-4381.2018.001239
Abstract   PDF (2266KB)
3D printing technology is one of the additive manufacturing technologies for rapid process and manufacture of complex geometric components. Based on the three-dimensional data model, the material is accumulated layer by layer controlled by computer, and eventually forms the solid object. Compared to the traditional manufacturing methods, 3D printing technology has many advantages, such as time saving, low cost, easy operation, no mold and strong controllability of component geometry, etc. Along with the development of this technology, several types of 3D printing technologies, such as fused deposition modeling, selective laser sintering, stereo lithography, digital light processing and solvent casting molding, have been produced according to the core of the printing technology, applicable materials and equipment composition. The principles and characteristics of the four most representative 3D printing forming processes were introduced in this paper, and the research progress of carbon nanotubes to reinforce polymer composites with different types of 3D printing forming processes applied in recent years was summarized. At the same time, it was predicted that the 3D printing molding technology will be developed towards the direction of high precision, industrialization, popularization and high integration in this field, and the research and development of 3D printing materials will also have more prospects.
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Research progress on two-dimensional nanomaterials MXenes and their application for lithium-ion batteries
QI Xin, CHEN Xiang, PENG Si-kan, WANG Ji-xian, WANG Nan, YAN Shao-jiu
Journal of Materials Engineering    2019, 47 (12): 10-20.   DOI: 10.11868/j.issn.1001-4381.2019.000510
Abstract   PDF (2239KB)
Lithium-ion batteries (LIBs) have been considered a promising candidate of new energy storage device. Numerous researchers around the world are committed to develop new materials for high-performance LIBs. MXenes are new type of two-dimensional nanomaterials, which are composed of transition metal, carbides or/and nitrides, with large specific surface area, good electrical conductivity, high lithium storage capacity, excellent cycling and rate performances, etc., making them as LIBs materials with bright application prospects. A variety of MXenes materials (such as Ti2CTx, Ti3C2Tx, V2CTx, Nb2CTx, etc.) have been reported to be useful as LIBs electrode materials. In addition, MXenes materials can be combined with other LIBs active materials to build good conductive network, accelerate electron transport and lithium ion diffusion, and inhibit materials pulverization caused by volume expansion of active materials during electrochemical processes. Besides, researches on MXenes materials in solid electrolytes, binders, and conductive agents for LIBs have also been reported. In this paper, the major breakthroughs in the application of MXenes materials for LIBs were reviewed. The preparation methods, structural properties and lithium storage mechanism of MXenes materials were introduced. Moreover, the specific application, existing problems of MXenes materials in LIBs have been concentrated on.This review points out that researches of MXenes materials should take advantages of their hydrophilicity and conductivity poperties,and focus on the development of composite electrode meterials,self-supporting electrodes materials etc.,which will bring breakthroughs to the key technologies of high-performance lithium-ion batteries.
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Research progress in aluminum alloy additive manufacturing
GAO Qing-wei, ZHAO Jian, SHU Feng-yuan, LYU Cheng-cheng, QI Bao-liang, YU Zhi-shui
Journal of Materials Engineering    2019, 47 (11): 32-42.   DOI: 10.11868/j.issn.1001-4381.2019.000084
Abstract   PDF (5388KB)
Aluminum alloy is the preferred material for lightweight structure, and has broad application prospects in aerospace, transportation and ships. The additive manufacturing of aluminum alloy possesses outstanding advantages and potential on fabricating complicated three-dimensional precision structural parts. Furthermore, this method can be characterized by its high efficiency and excellent structural properties. With regard to the rapid development of the aluminum alloy additive manufacturing, the research status and latest achievements of aluminum alloy fabricated with additive manufacturing from the aspects of structure and performance, precision and quality, controlling of defects and numerical simulation, and the shortcomings of current research were summarized. Based on these, the key issues that will be focused were summarized at last, including realizing the control of the micro-structure, clarifying the forming mechanism of the stress, improving the forming accuracy, and studying the distribution law of the temperature field in the forming process.
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High speed impact properties of carbon fiber/epoxy resin composites
GU Shan-qun, LIU Yan-feng, LI Jun, CHEN Xiang-bao, ZHANG Dai-jun, ZOU Qi, XIAO Feng
Journal of Materials Engineering    2019, 47 (8): 110-117.   DOI: 10.11868/j.issn.1001-4381.2018.000501
Abstract   PDF (7774KB)
The carbon fiber/epoxy resin composites were prepared by the resin transfer molding (RTM) process. Effect of resin toughness and carbon fiber type on the high speed impact properties was investigated using the air cannon impact test. The effect of high speed impact damage on the residual compressive property of the composites was studied by the compression performance test of the samples which were impacted at high speed. The results demonstrate that the resin toughness can greatly reduce the internal damage degree of composite materials subjected to high speed impact, and can improve the anti-high speed impact property and residual compressive property of the composites. Also, the anti-high speed impact property of T700S carbon fiber reinforced composites is superior to that of the T800H carbon fiber reinforced composites. The results also indicate that failure modes are highly dependent on the impact velocity. Specifically, when the impact velocity is low, the composites appear a circular pit on the impact surface while the back surface appears a convex protrusion. Also, when the impact velocity is high, a circular hole is formed on the impact surface of composites, and the tearing fracture along the fiber direction is observed on the back surface.
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Research and application status on biomimetic materials in the water harvesting area
CHEN Zhen, ZHANG Zeng-zhi, DU Hong-mei, WANG Han, WANG Li-ning, CONG Zhong-hui, WU Hao-ping
Journal of Materials Engineering    2020, 48 (3): 10-18.   DOI: 10.11868/j.issn.1001-4381.2018.001432
Abstract   PDF (1902KB)
Nowadays,water shortage has become a severe issue all over the world, especially in some arid and undeveloped areas. In nature, many creatures can collect water from fog which can provide a source of inspiration to develop novel and functional water-collecting materials. Recently, as an increasingly hot research topic, bioinspired materials with water collection have captured vast scientific attentions into both practical applications and fundamental researches. In this paper, the mechanism of water collection of Namib desert beetle, cactus and spider silk was summarized, and the synthesis, function and water collection efficiency of corresponding biomimetic materials were described, as well as new developments in recent years. Finally, conclusions and outlook concerning the main problems and development trends of bionic water-collecting materials in the process of preparation and application were presented.
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Research progress in high-entropy alloy coatings by laser cladding
ZHAO Hai-chao, LIANG Xiu-bing, QIAO Yu-lin, LIU Jian, ZHANG Zhi-bin, TONG Yong-gang
Journal of Materials Engineering    2019, 47 (10): 33-43.   DOI: 10.11868/j.issn.1001-4381.2018.000998
Abstract   PDF (1119KB)
High-entropy alloy(HEA) coatings with high thermal stability and high temperature resistance of HEA coatings show a new attraction in the field of high temperature coating. The method of preparing HEA coating(HEAc) by laser cladding technology is one of the best preparation methods which can achieve superior performance. The latest research results of HEAc prepared by laser cladding technology were summarized from the view of component design, microstructure, annealing process and properties, high temperature oxidation resistance and other properties. The problems existing in the preparation of HEAc by laser cladding technology were analyzed. It was put forward that the scientific research system should be perfected from the aspects of component design, basic theory, performance law and processing technology in the future. The high-entropy alloy coatings with excellent performance are expected to be prepared.
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Research progress in bio-based synthetic rubber
JI Hai-jun, QIAO He, WANG Zhao, YANG Hui, WANG Run-guo, ZHANG Li-qun
Journal of Materials Engineering    2019, 47 (12): 1-9.   DOI: 10.11868/j.issn.1001-4381.2019.000207
Abstract   PDF (4244KB)
As entering the 21st century, the development of petrochemical synthetic rubber is unsustainable, and is gradually constrainted by energy saving and emission reduction. The production of natural rubber is limited and affected by factors such as climates,epidemic diseases, etc. China's natural rubber self-supporting is insufficient, rely heavily on imports. In the face of the above challenges, the development of a new generation of bio-based rubber resources independent of fossil resources from solar energy is an effective means to solve the shortage of rubber resources and the only way to ensure the safe, long-term and stable supply of global rubber resources. At present, there are two main ideas for the preparation of bio-based synthetic rubber. The research progress of two types of bio-based synthetic rubber was mainly reviewed in this paper. One is to further convert bio-based monomers (such as ethanol) obtained by fermentation of biomass into conventional monomers (such as ethylene), then the bio-based conventional rubber such as bio-based ethylene propylene rubber and bio-based isoprene rubber will be prepared by a conventional synthetic process, and its performance is almost identical to that of a conventional non-bio-based engineering elastomer, and the existing engineering rubber can be directly replaced; the other is to prepare a novel structure of bio-based rubber materials through polymerization using the existing bio-based chemicals, such as itaconic acid, propylene glycol, succinic acid, etc. The raw materials can be easily obtained, the cost is low, and with the rapid development of fermentation technology, more and more bio-based chemicals will be available for selection and use, and bio-based synthetic rubber has bright prospects.
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4D printing and its key technologies
SHEN Zi-cai, XIA Yan, DING Yi-gang, ZHAO Chun-qing, YANG Yan-bin
Journal of Materials Engineering    2019, 47 (11): 11-18.   DOI: 10.11868/j.issn.1001-4381.2018.000610
Abstract   PDF (1567KB)
4D printing can be defined as the evolution of 3D printing structure in terms of shape, performance and function. It has time dependence, printer independence and predictability, and its smart dynamic performance creates promising capabilities and broad potential applications. On the basis of a brief review of the status of 4D printing at home and abroad, the concept and components of 4D printing were given firstly. Then the 4D printing was classified from the dimension of printing structure shape change. Furthermore, the key technologies such as printing materials, incentive mechanism and mathematical modeling method in 4D printing elements were analyzed. Finally, it was pointed out that the development direction of 4D printing technology is to combine intelligent materials with 3D printing, simplify the manufacture of complex structures, and realize the automation, intellectualization and personalization applications in special service environments and fields such as aerospace, deep sea and precise medical treatment by using its unique characteristics of self-assembly, self-adaption and self-repairing.
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Research and application progress in ultra-high strength stainless steel for aircraft landing gear
WANG Xiao-hui, LUO Hai-wen
Journal of Materials Engineering    2019, 47 (9): 1-12.   DOI: 10.11868/j.issn.1001-4381.2019.000122
Abstract   PDF (3233KB)
Based on the design concept of aircraft landing gear, the recent achievements in research and development on both ultra-high strength steels and ultra-high strength stainless steels (UHSSS) for the landing gear in aircraft were reviewed. The composition, microstructure and mechanical properties of typical commercial UHSSS grades that were produced and used were also summarized. It was then proposed that the future research on UHSSS with the improved combination of strength and toughness should focus on designing both composition and processes of new UHSSS grades by using the up-to-date material thermodynamic and kinetic calculations, particular attention should be paid to microstructural designing on either high density coherent or multi-type nanosized precipitation and the deliberate tailoring of retained austenite with enhanced mechanical stability for toughening; both of them could contribute to the strengthening and toughening of UHSSS. Finally, the updated hot working technology was put forward, the isothermal multi-direction forging, which could significantly improve the comprehensive mechanical properties of UHSSS.
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Research progress on NITE process for fabricating SiCf/SiC composites
Journal of Materials Engineering    2019, 47 (8): 33-39.   DOI: 10.11868/j.issn.1001-4381.2019.000048
Abstract   PDF (904KB)
Nano-infiltration and transient eutectic (NITE) process is a new method for fabricating silicon carbide fiber reinforced silicon carbide based (SiCf/SiC) composites, which has the advantages of short production cycle, simple process and low production cost. The material made by NITE process is with compact matrix, low porosity, and free of residual silicon, therefore, it is suitable for high temperature and long service environments at 1400℃ and above. At present, Japan, the United States and other countries have carried out in-depth research on this technology based on the mature third-generation silicon carbide fiber, and applied the composites in fields such as nuclear energy industrial heat exchangers and aero-engine combustor liners. In this paper, the basic concepts, the manufacturing process, the mechanical properties of SiCf/SiC composites and component verification and prospects of NITE process were reviewed, in order to provide the reference to a certain degree for the domestic development of this process.
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Research progress of piezoelectric nanogenerators and their hybrid devices
TAN Yao-hong, LIU Cheng-kun, MAO Xue, LIU Jia
Journal of Materials Engineering    2019, 47 (10): 10-21.   DOI: 10.11868/j.issn.1001-4381.2018.000665
Abstract   PDF (6290KB)
The energy crisis and environmental pollution from excessive use of traditional fossil fuel have been prompting a number of researchers and institutes to develop new technology, emerging mat-erials, and potential applications for green, sustainable and renewable power source. There is a rich source of energy in the environment and therefore it is very promising to collect energy from the envir-onment. The mechanical energy can be transformed into electric energy when the piezoelectric material experiences mechanical deformation due to the transfer of internal electron. Therefore, as a potential sustainable, green energy source, piezoelectric nanogenerator has received extensive attention in rec-ent years. Some research achievements in recent years were reviewed in this paper, starting from the classification of piezoelectric materials and combining with their preparation methods, structure and properties. The effects of different preparation methods and structures on piezoelectric properties of piezoelectric nano-generators were evaluated in detail. The future development was also prospected.
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Research and application progress of open-cell polymeric foams
CHEN Zhen, ZHANG Zeng-zhi, CONG Zhong-hui, WANG Li-ning, WU Hao-ping
Journal of Materials Engineering    2020, 48 (3): 1-9.   DOI: 10.11868/j.issn.1001-4381.2019.000308
Abstract   PDF (2029KB)
Polymeric foams have become essential items due to their excellent properties. Open-cell foams are widely used in the fields of sound-absorbing, biomedicine, optics, conduction, etc. In particular, polymer nanocomposites offer modern medicine new opportunities for generating products for antibacterial treatment, tissues engineering, cancer therapy, medical imaging, dental applications and drug delivery, etc. In this paper, the preparation methods, foaming mechanism and application fields of open-cell foams were described, as well as new developments in recent years. Finally, the main problems in the process of material preparation and application were summarized and the future development trend of polymer blending, formation of micro-nano composites, coating of high-barrier materials and polymer modification for the preparation of high-performance open-cell polymer foams was forecasted.
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Infrared stealth metamaterials
LIU Xiao-ming, REN Zhi-yu, CHEN Lu-ping, LI Guo-jian, WANG Qiang, ZHOU Ji
Journal of Materials Engineering    2020, 48 (6): 1-11.   DOI: 10.11868/j.issn.1001-4381.2019.001019
Abstract   PDF (6942KB)
The basic principles and methods of infrared radiation and infrared stealth technology were discussed in this paper. It was found that flexible regulation of multi-band spectrum was the key to realize infrared stealth compatible with radar stealth, laser stealth and visible light stealth. The research status of traditional infrared stealth materials were summarized and the bottleneck of their development was clarified. Furthermore, the design idea, research basis and development advantages of infrared stealth metamaterials with spectral tailoring function were proposed. We reviewed the research status and development trend of the infrared stealth compatible with radar stealth, infrared stealth with infrared radiation window and infrared stealth compatible with laser and visible light.
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Research progress in layered double hydroxides catalysts for oxygen evolution reaction
XIE Bo-yao, ZHANG Ji-mei, HAO Shuai-shuai, BI Ming-gang, ZHU Hai-bin, ZHANG Li-ping
Journal of Materials Engineering    2020, 48 (1): 1-9.   DOI: 10.11868/j.issn.1001-4381.2018.000900
Abstract   PDF (1934KB)
The layered double hydroxides become research hot spot of oxygen evolution catalyzer for its easy preparation, feasible moderation of interlayer object,low cost and good stability but due to its low transmission speed of its electric charge,higher overpotential, so the modification is needed before mass application. The constructional character of the layered twinned material was firstly introduced, the catalytic mechanism of its oxygen evolution reaction was briefly described, then different kinds of optimization modification strategies to enhance its catalytic activity were introduced. The optimization modification strategies include:combination with conductive substrate, synthesis ultrathin nanometer plate, graphene compounding process, hybrid modification. The application of the stratified dihydride oxygen evolution catalyst in electrolysis of water to hydrogen and the advantages and disadvantages of different modification methods were put forward. The better-efficient oxygen evolution catalyst can be achieved through different kinds of modification. In the end, the difficulties in this kind of catalyzer were pointed out, including low recycle rate, catalyst stability, current density not meeting the requirements of industrialization and massive production.
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Research progress in carbon-based/carbonyl iron composite microwave absorption materials
GE Chao-qun, WANG Liu-ying, LIU Gu
Journal of Materials Engineering    2019, 47 (12): 43-54.   DOI: 10.11868/j.issn.1001-4381.2018.000220
Abstract   PDF (3629KB)
Carbon-based/carbonyl iron composite microwave absorption materials have become a hot topic in recent years because of the combination of their respective advantages and unique physical and chemical characteristic and good absorbing properties. In this paper, the most recent and important research advances in carbon-based/carbonyl iron composite microwave absorption materials were reviewed. Firstly, the recent research of property improving of carbonyl iron itself was introduced. Then, the research achievements of carbon-based/carbonyl iron composite microwave absorption materials were summarized in six major categories, graphene/carbonyl iron microwave absorption materials, carbon nanotubes/carbonyl iron microwave absorption materials, carbon fibre/carbonyl iron microwave absorption materials, carbon black/carbonyl iron microwave absorption materials, graphite/carbonyl iron microwave absorption materials and the other composites were reviewed in detail. Finally, the performance control and lightweight of carbon-based/carbonyl iron composite microwave absorption materials were pointed out, and its development prospect in broadband stealth was prospected.
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Effect of spinning process on the properties of T800 carbon fiber and its reinforced composite
ZHANG Shi-jie, WANG Ru-min, LIU Ning, LIAO Ying-qiang, CHENG Yong
Journal of Materials Engineering    2019, 47 (8): 118-124.   DOI: 10.11868/j.issn.1001-4381.2018.001454
Abstract   PDF (2965KB)
The surface conditions of the two different T800 carbon fibers by the wetting (T800HB) and the dry jet-wetting spinning processes (T800SC) were characterized and analyzed by scanning electron microscope (SEM), atomic force microscope (AFM), X-ray photoelectron spectroscope (XPS) and contacting-angle measuring instrument. The mechanical properties of their multifilaments, NOL rings and unidirectional laminates were evaluated by universal material testing machine. Results show that the surface of T800HB by wetting process is rougher, while the surface of T800SC by dry jet-wetting process is more chemical-active. Both chemical interaction and mechanical engagement between fiber and resin matrix result in the similar interlaminar shear strength (ILSS) of T800HB and T800SC. However, when the composite is damaged, the interfacial bonding of T800HB/resin seems tighter dominated by the mechanical engagement, leading to brittle fracture feature of T800HB reinforced composite, while T800SC reinforced composite exhibits ductile fracture feature with weaker interfacial bonding. In addition, the tensile strength of filament of T800SC is higher than that of T800HB. Accordingly, the tensile strength of NOL ring and unidirectional laminate composite of T800SC are higher than those of T800HB. Therefore, in combination of mechanical properties of carbon fibers by two kinds of spinning processes and their reinforced composites, as well as their fracture features, compared with T800HB, T800SC is more suitable to be the reinforcement of the composite fabricated by filament winding process.
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Research progress in plastic deformation mechanism of Mg alloys based on molecular dynamics
YANG Bao-cheng, PENG Yan, PAN Fu-sheng, SHI Bao-dong
Journal of Materials Engineering    2019, 47 (8): 40-48.   DOI: 10.11868/j.issn.1001-4381.2017.001301
Abstract   PDF (2507KB)
The computational material science based on molecular dynamics method is critical for the investigation of the micro-nano scale plastic deformation, which helps to clarify the competition relationship between different plastic deformation mechanisms of magnesium alloys.The mechanism of slip, twinning and grain boundary sliding in magnesium alloys was summarized; the basic principles of molecular dynamics and the potential functions commonly applied to the hexagonal close-packed structure metals were briefly introduced. Moreover,the research progress of plastic deformation mechanism of Mg alloys based on the molecular dynamics was mainly analyzed. Based on the main problems mentioned above, it was pointed out that the development of high-precision potential function for magnesium alloy multiple systems and how to achieve the relationship of multiple scales will be the focused directions in the further research.
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Research progress in preparation and application of hemicellulose-based hydrogels
WEN Jing-yun, QIU Xiao-yu, LI Ming-fei, PENG Feng, BIAN Jing, SUN Run-cang
Journal of Materials Engineering    2020, 48 (2): 1-10.   DOI: 10.11868/j.issn.1001-4381.2019.000500
Abstract   PDF (1363KB)
Hemicellulose-based hydrogels are three-dimensional networks formed by crosslinking hydrophilic polymers with tunable swelling behavior,acceptable biocompatibility and mechanical properties,and have received much attention in the field of soft materials especially in hemicellulose-based materials.Herein,recent advances and developments in hemicellulose-based hydrogels were reviewed.The preparation methods,mechanism of their gelation process,and the performance of the hemicellulose-based hydrogels were presented from both chemical and physical cross-linking approaches,while the differences in various initiation systems such as light,enzyme,microwave irradiation and glow discharge electrolysis plasma in chemical cross-linking were compared.The latest applications of hemicellulose-based hydrogels in drug-controlled release,wound dressing,water purification,3D printing dispersions, etc,were introduced, respectively.Finally,the challenges in the development of hemicellulose-based hydrogels were summarized briefly and future prospect was also given,which provides a reference for the synthesis of new hemicellulose-based hydrogels.
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Effect of conductive carbon black on electrochemical performance of Li- and Mn-rich layered oxide electrode
HUANG Xian-kai, SHAO Ze-chao, CHANG Zeng-hua, WANG Jian-tao
Journal of Materials Engineering    2019, 47 (8): 13-21.   DOI: 10.11868/j.issn.1001-4381.2019.000129
Abstract   PDF (15902KB)
High voltage Li- and Mn-rich layered oxide (LMRO) electrodes with different amount of conductive carbon black Super P were investigated to explore the effect of carbon black on electrochemical performance of the electrode and scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) were utilized to study the internal reason why the amount of Super P affects the performance of the electrode. The results show that the performance of cycle stability and high-rate capability of LMRO electrodes exhibit the tendency of increasing first and then decreasing with increase of Super P content, while the optimum performance of electrodes is obtained at 5% (mass fraction,the same below). With the increase of Super P content, electronic contact between LMRO particles and Super P particles can be improved, electrically conductive network can be constructed, resistance between electrode components can be decreased, and electrode polarization can be reduced. However, when the content is higher than 5%, Super P particles are easily agglomerated, which is undesirable for further improving the conductivity of electrode.
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Effects of graphene oxide on microstructure and mechanical properties of 600℃ high temperature titanium alloy
CHEN Hang, MI Guang-bao, LI Pei-jie, WANG Xu-dong, HUANG Xu, CAO Chun-xiao
Journal of Materials Engineering    2019, 47 (9): 38-45.   DOI: 10.11868/j.issn.1001-4381.2019.000284
Abstract   PDF (11309KB)
The 600℃ high temperature titanium alloy composite with graphene oxide addition was prepared by temperature-controlled mixing method and hot isostatic pressing. Microstructure and mechanical properties of composite were studied by metallographic observation, energy spectrum analysis, phase analysis and tensile test. The results show that graphene oxides are dispersed uniformly in the 600℃ high temperature titanium alloy powder when the content of graphene oxide is 0.3%(mass fraction) and the main mode of action is physical adsorption. Compared with the alloy without graphene oxide, the microstructure of the composite with 0.3% graphene oxide is obviously refined, and the average size of equiaxed alpha phase is reduced by 36%. Meanwhile, the average room temperature tensile strength and yield strength increase by 7.8% and 10.4% respectively and Vickers hardness increases by 25.6%. The strengthening mechanisms of graphene oxide on 600℃ high temperature titanium alloy mainly include grain refinement strengthening,dislocation streng-thening and precipitation strengthening of the (TiZr)6Si3 second-phase.
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Cyanate ester for domestic T800 carbon fiber and its composites properties
OU Qiu-ren, JI Pei-jun, XIAO Jun, WU Ling, WANG Lu
Journal of Materials Engineering    2019, 47 (8): 125-131.   DOI: 10.11868/j.issn.1001-4381.2018.000289
Abstract   PDF (1511KB)
In order to reduce the aircraft mass via high-temperature composite structures, and to extend the application of domestic T800 carbon fiber reinforced cyanate ester composites system, the sizing was analyzed, and the cyanate ester formulation was designed for the carbon fiber based on the sizing analysis. Meanwhile, the mechanical properties and heat resistance of the domestic T800 carbon fiber/cyanate ester composites were studied, and the effect of matrix on the composites interface was studied. The results indicate that the sizing of domestic T800 carbon fibers contain epoxy functional groups. With the formula optimized cyanate ester resin, the domestic T800 carbon fiber composite has greater mechanical property with the retention rate exceeding 74.8% at room-temperature with humidity, the retention of mechanical property is more than 57% at 200℃, and the glass transition temperature is 226℃. The composite exhibits excellent thermal mechanical and interfacial properties.
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Research progress of polymer electrolytes in supercapacitors
XUN Zhi-yu, HOU Pu, LIU Yang, NI Shou-peng, HUO Peng-fei
Journal of Materials Engineering    2019, 47 (11): 71-83.   DOI: 10.11868/j.issn.1001-4381.2019.000346
Abstract   PDF (5418KB)
With the rapid development of portable devices, polymer electrolytes with high safety performance are receiving widespread attention. The polymer electrolytes applied in supercapacitors in recent years were introduced in this review, including all-solid-state polymer electrolytes, gel polymer electrolytes, porous polymer electrolytes, composite polymer electrolytes and redox polymer electrolytes capable of providing pseudocapacitance, and the characteristics and research progress were also discussed in details. It was proposed that the development of organic composite gel polymer electrolytes with wide voltage window, high ionic conductivity, high mechanical strength and light weight will be the trend in the field of electrolytes for supercapacitors in the future. Polymer electrolyte with excellent comprehensive performance will play an important role in the field of new energy resources such as supercapacitors.
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Research progress on carbon nano-materials to construct Li-ion and Li-S batteries of high performance
WU Yi-fang, CHONG Shao-kun, LIU Yong-ning, GUO Sheng-wu, BAI Li-feng, ZHANG Cui-ping, LI Cheng-shan
Journal of Materials Engineering    2020, 48 (4): 25-35.   DOI: 10.11868/j.issn.1001-4381.2019.000590
Abstract   PDF (5426KB)
Carbon solely can form a lot of nanostructures, such as zero-dimensional nanosphere, one-dimensional nanotube and two-dimensional graphene. They perform differently in Li-ion and Li-S batteries. It is worth noting that CNTs and graphene are not appropriate to be used as electroactive materials for Li-ion or Li-S batteries for four reasons. First, when CNTs and graphene are used as an anode, they often exhibit high specific capacities during the first lithiation step, but a large fraction of lithium ions is irreversibly consumed instead of reversibly stored, leading to a low Coulombic efficiency of the cell. Second, a graphene-based anode has a large voltage hysteresis in the charge/discharge curves. Third, it has been reported a CNT-based anode lacks a steady voltage plateau with large change in voltage during discharge. Fourth, despite their high initial capacities, graphene and CNT-based anodes often suffer from fast capacity decay after a few tens of cycles. Continuous efforts have been made to build better lithium batteries with a higher energy density and wider applicability, including both current state-of-the-art Li-ion batteries and near-term Li-S batteries. Because the behavior of a rechargeable battery is mainly based on the performance of its anode and cathode, designing advanced electrode materials as well as electrode with tailored compositions and structures has been the hot topic in recent years. The role of carbon nano-materials to construct electrode materials and tailored electrodes in Li-ion and Li-S batteries in high performance was reviewed in the paper from three aspects. Firstly, the role of carbon nano-materials in modifying the electroactive materials was discussed from three aspects:electron- and ion-transport facilitators, immobilization sites and volume expansion buffering. Secondly, the role of carbon nano-materials in optimizing the inactive components was considered as follows:conducting additives, current collectors and conductive interlayers. Thirdly, the role of carbon nano-materials in designing the bendable and stretchable devices are discussed from three aspects:conductive phases in nonconductive substrates, flexible current collectors and freestanding composite electrode. Finally, perspectives on future development of Li-ion and Li-S batteries were presented. It is considered that multi-functional carbon nano-materials will be main research focus in the future.
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Effect of fluorinated multi-walled carbon nanotubes as cathode on performance of Li/CFx batteries
LI Xu, SUN Xiao-gang, CAI Man-yuan, WANG Jie, CHEN Wei, CHEN Long, QIU Zhi-wen
Journal of Materials Engineering    2019, 47 (8): 22-27.   DOI: 10.11868/j.issn.1001-4381.2017.001307
Abstract   PDF (3066KB)
Multiwalled carbon nanotubes(MWCNTs) were fluorinated to get the material of MWCNTs fluoride with different atomic ratio. The ratio of fluorine and carbon was 0.28(CF0.28), 0.56(CF0.56) and 0.78(CF0.78) respectively. The fluoride MWCNTs were used as cathode active material to coat on aluminum foil, lithium metal foil as counter electrode in Li/CFx batteries. The structures and properties were characterized by thermal gravimetric analyzer(TGA), scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS). The electrochemical performance was tested by galvanostatic discharge test. The results show that the battery with CF0.78 has the best electrochemical performance. At the current density of 39mA/g, the battery displays high discharge specific capacity of 724mAh/g and appears with a more stable platform for the discharge process. At the current discharge rate of 0.05C, the utilization of three kinds of MWCNTs fluoride electrodes is 73.4%, 89.6%, 92.9%. When the discharge rate is 2C, batteries with three different MWCNTs fluoride have discharge specific capacity attenuation rate of 68.8%, 34.1%, and 39.6%. It indicates that the discharge specific capacity attenuation rate can be mitigated to a certain extent with the improved level of fluoridation. Although the discharge capacity attenuation rate of CF0.78 is higher than that of CF0.56, CF0.78 has the most stable discharge curve at the same discharge rate.
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Research progress in effect of static magnetic field on microstructure of directionally solidified Ni-based superalloy
LIU Cheng-lin, SU Hai-jun, ZHANG Jun, LIU Lin, FU Heng-zhi
Journal of Materials Engineering    2019, 47 (9): 13-20.   DOI: 10.11868/j.issn.1001-4381.2018.000268
Abstract   PDF (7077KB)
The current research progress in the influence of static magnetic field on the microstructures of directionally solidified Ni-based superalloy at home and abroad was reviewed, and the effect of different ways, strength of static magnetic fields on the dendritic microstructure, elemental segregation, solidification defects and high temperature mechanical properties was emphatically analyzed. The potential development of static magnetic field in directional solidification of nickel-based superalloy was proposed from the control of stray crystals at variable cross-sections, the control of crystal orientation deviation, and the influence mechanism of static magnetic field on solidification properties.
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